15254 %ymm registers not restored after signal handler
15367 x86 getfpregs() summons corrupting %xmm ghosts
15333 want x86 /proc xregs support (libc_db, libproc, mdb, etc.)
15336 want libc functions for extended ucontext_t
15334 want ps_lwphandle-specific reg routines
15328 FPU_CW_INIT mistreats reserved bit
15335 i86pc fpu_subr.c isn't really platform-specific
15332 setcontext(2) isn't actually noreturn
15331 need <sys/stdalign.h>
Change-Id: I7060aa86042dfb989f77fc3323c065ea2eafa9ad
Conflicts:
    usr/src/uts/common/fs/proc/prcontrol.c
    usr/src/uts/intel/os/archdep.c
    usr/src/uts/intel/sys/ucontext.h
    usr/src/uts/intel/syscall/getcontext.c

@@ -54,10 +54,11 @@
 struct lwpsinfo;
 struct prcred;
 struct prpriv;
 struct prsecflags;
 struct prfdinfo;
+struct prxregset;
 
 struct seg;
 struct regs;
 struct watched_page;
 

@@ -75,12 +76,12 @@
 extern void prgetstatus(proc_t *, struct pstatus *, zone_t *);
 extern void prgetlwpstatus(kthread_t *, struct lwpstatus *, zone_t *);
 extern void prgetpsinfo(proc_t *, struct psinfo *);
 extern void prgetlwpsinfo(kthread_t *, struct lwpsinfo *);
 extern void prgetprfpregs(klwp_t *, struct prfpregset *);
-extern void prgetprxregs(klwp_t *, caddr_t);
-extern int  prgetprxregsize(proc_t *);
+extern void prgetprxregs(klwp_t *, struct prxregset *);
+extern size_t prgetprxregsize(proc_t *);
 extern void prgetcred(proc_t *, struct prcred *);
 extern void prgetpriv(proc_t *, struct prpriv *);
 extern size_t prgetprivsize(void);
 extern void prgetsecflags(proc_t *, struct prsecflags *);
 extern uint_t prnsegs(struct as *, int);